Valve



- 1,634,360 F. HOFMANN VALVE July 5, 1927.v

Filed May 28, 1926 Q H v BY [R -m ATTORN EYS July 5,

unites starts orrics.

snrnnnrcn norm/term, or MULHEIM-BUI-In, enema-air,

ASSIGNOR TO HOLZWARTH GAS TURBINE 00., OF SAN FRAIECESCO, CALIFORNIA, A CORPORATION OF DELA- WARE.

VALVE.

My invention relates to valves and more particularly to valves for internal combus tion turbines whereby the nozzles of such engines are controlled. Because of the fact that engines of this type are ofttimes constructed on very large scales, valves for con-' trolling the nozzles therein are of correspondingly large size and are subjected to the effects of relatively large charges of e:-;- plosion gases. Due to the extremely injurious action of such explosion gases, particularly in relatively large charges thereof, such control valves repeatedly become inefficient for their intended purposes and require either repeated regrinding or replacing, as the case may be. For these reasons it has heretofore generally been necessary to construct such valves of a very high grade of steel capable of withstanding the action of the gases and of being repeatedly refaced for continued use.

l he object of the present invention is to provide a valve in which the existing de fects are overcome and which is particularly adapted for controlling the nozzles of inter: nal combustion turbines and is constructed in a novel manner to efficiently and positively protect the active sealing surface of the valve against the injurious effects of the aforesaid explosion gases. 0t er more specific objects will appear from the description hereinafter and the features of novelty will be pointed out in the claims.

In the accompanying drawing, which shows an example of the invention without defining its limits, Fig. 1 is a fragmentary sectional view of the combustion chamber and nozzle with the improved valve con bined therewith and illustrat in its closed position, and Fig. 2 is a similar view showing the valve in its open position.

In the drawing, 10 represents a portion of the combustion chamber of an internal combustion turbine of any conventional forr; and communicating in the well-known way with the customary nozzle ring thereof. The chamber 10 as shown is provided with a valve seat 11 which, in the illustrated example, is shown in the form of a removable nozzle ring detachably secured inplace by means of bolts 12; the outer exposed surface of said ring comprises a plane surface 13 which constitutes anannular sealing surface adapted to cooperate with the valve, as will be more fully pointed out hereinafter, to controlthe flow of gas from the chamber 10 and through the aforesaid nozzle rin in the preferred arrangement, the interior annular surface '14 of the valve seat 11 converges toward its center along a curved line from the chamber 10 and then flares outwardly to itspointrof connection with the plane surface 13. While the arrangement set forth is preferrethit will be understood that other equivalent arrangements may be utilized without materially interfering with the eiiiciency of the construction. The valve comprises a-stein 15 which may be of any conventional form and which, at its one end, terminates in a head 16 to which the body 17 of the valve is secured, for instance by means ofrivets or the like 18. The valve body 17 is'provided with a sealing member 19 which includes annular plane sealing surface 20 adapted to cooperate with the sur face 13 of the valve seat 11 to close the outletfrom the chamber 10 and the said noz' zle ring. In adcit'ion to the above, the valve includes a deflecting member 21 which projects from the body 17 through the circular space defined by the sealing member 19 and is provided with a plane end surface 22 locatcd in parallelism with the sealing surface 20 and beyond the same in an axial direction, as illustrated in the drawing. The peripheral surface of the deflecting member 21 curves outwardly with respect to the chamber 10 and joins the sealing member 19 at its inner annular surface, which, as shown, may be bevelled with respect to the axis of the valv the ar angement is such that the periphery of the surface 22 is a relatively sharp well-defined edge, the purpose of which will appear more fully hereinafter.

in the closed position of the valve, as shown in F 1, the sealing surface 20 of the lve is positively and firmly seated upon me surface 13 of the valve seat 11 and thereby closes the exit aperture of the chamber 10. in the open positionof the valve, as shown in 2, the explosion gases or other medi in controlled by the valve, in their exit item the chamber 10 or its equivalen npact squarely against the surface 22 a l are cetlected thereby in directions at right angles to the axis of the valve, as diagrammatically indicated by the arrows in Fig. 2. Because of the factthat the surface 22 is located beyond the surface 20 in an axial (lII'OOiJIOD OI HI a CllIGCiliOII-fl'OHl which the gases or their equivalent approach the open valve, and due to the fact that'theperiphe 'a-l' edge-0f saidisuriface 22. is; relativelysharp;.these gasesaor; other. media: are sharply deflected and accordingly are maintained out of contact with the surface 20 so that the latter at no time is engaged by or comes into contact With these hot gases or theirequivalent. The surface 20 thus maintains its sur face characteristics indefinitely; and tlie val' veconsequentlyretains. its: effici ency and remains fluid ti ght for" amaximum period. Regrinding of thevalve sur-face20' is; tlius done away With entirely or required only at extremely 'long intervals. Because oftlii's fact, it is possible to 'cast the" valve body 7 and its associated" parts in cast iroir Without affecting the efiiciency of the valve a closure; thereby reducing tlie cost of pro duction to minimum; The stem 1'5"- an d. its head 16 may be" constructed of'steel or. other suitable material}. a

The novel construction and; arrangement illustrated" and described provides a' valve which is particularly adapted to Withstand the intensively destructive effects eXcep tional to-the operation oftint'ernal; combus-x tion engines" and particularly of? largein; ternal combustion" turbines:

Various" changes in the" specific: form shown and" described may be made Within the scope of the elaimswithout'r departing from the: spirit ofi my invention;

I claim 1. A valve for internal? combustion tur bines comprising a stem, a valve body carrieditliereby, an annular projection;on said body having an annular sealing surface extendin'gin a plane transverse to the axis of said 1 valve; and a deflecting unember. proj ecting; through the circular: space defined by said annular projection and beyond said sealing surface, said deflecting member having a plane end surface against which the medium controlled by said valve impinges and whereby said medium as it passes bythe seat controlledby sa-id valve is defleetedout of 'contact with said sealing-sue face when saidv-alve is in its open-position 23 Iiian internal combustion turbine, the combination ofa nozzle'and a combustion chamber for explosive gases communicating with said nozzle a valveseat including an annular'plane"sealing surface at the eXitend of'said' nozzle a nozzle valve includinga body", an annular projection on said body having an annular plane sealing surface a'd'apted to cooperate with said' first named sealing-surface to ClOSQSRiCl GX'liJ end, and a deflecting; member projecting through the circular space defined" by" the annular projection and 'liaving a plane deflecting sur face located beyond and inparallelism with tli'e'sealing" surface of said annular projection whereby explosive gases as they passthrough said exitendof the nozzle'are deflected out of contact \vith'the sealing'sur face'of: said valve;- in the open position of the valve;

Intestiinony'whereof I liavehereunto set my: hand.

FRIEDRICH HOFMAN'N. 

